Boiler-furnace.



W. LEMB.

BOILER FURNACE.

APPucATIoN HLED APR.24. 17916.

1,205328; Patented Nov. 21, 1916.

2 SHEETS- SHEET I.

o o o o b u Inventar William Lemb,

Lay w ww Patented Nov. 21, 1916.

2 SHEETS-SHEET 2.

W. LEMB.

BOILER FURNACE;

APPLICATION FILED APR.24, l9l6. 1,205228.

III/44% 4,49242 OOOOOOOOO OOOOOOOOO PATENT WILLIAM LEMB, OF IBROOKLYN, NE'W' YORK.

BOILER-FURNACE.

Specifieation of etters Patent.

Patented Nov. 21, 1913.

Application filed April 24, 1916. SeriaI No. 93,220.

To all whom z't may concem:

Be it known that I, WILLIAM LEMB, a citizen of the United States, and a resident of Brooklyn, in the county of Kings and State of New York, have invented certain new .and useful Improvements in Boiler-Furnaces, of which the following is a specific-ation. A

The object of the present invention is to provide an improved construction and ar rangement of boiler furnaces whereby the heavy smoke is practically all consunied in the furnace and not permitted to pass out of the smoke stack; and further the discharge of objectionable dust is prevented.

A further object is to provide a construction for` this purpose that embodies a simple and inexpensive arrangement of the bridge wall that is usually provided at the rear of the furnace grate; and in connection therewith certain simple deflecting members are -arranged to interoept the smoke and gases between the bridge wall and the portion of the boiler first engaged by the gases. i

A further object is to provide in such an arrangement, means whereby the outsideoair is introduced, preferably in a heated condition, into the furnace gases, which air is heated by ineans of the hot Walls of the furnace bridge, without the use ofspecial heating means, or the employment of steam for this purpose.

In the accompanying drawings, illustrating one embodiment of my invention, F igure 1 is a vertical section through the apparatus. Fig. 2 is a horizontal section on the line 2-2 of Fig. 1. Fig. 3 is a perspective view of the interior of the furnace, with the boiler omitted. Fig. lis a section 'on the line i fl of Fig. l. Fig. 5 is a cross section on the line 5-5 of Fig. l; and Fig. G is a transverse section on the line 6-6 of Fig. 1.

In the arrangement set forth my invent-ion is applied to an ordinary cylindrical boiler of the tubular type, having interior longitudinall-passages for the furnace gases to pass from one end to the other, which is a well known construction. lVith such a form of boiler, it is customary to support the boiler 7 at its two side portions upon side walls 8 .and 9, whereby the entire lower half ofthe boiler is eXposed to the fire grate partly, and to the furnace at the rear of the grate. But it is well known in this art to provide a baffle wall, either straight or curved corresponding to the lower half of a cylindrical boiler, with the type of boilers known as water tube boilers that comprise usually two headers Connected by a set of tubes that contain the water. It is to be understood that my invention is applicable to any form of boiler setting where the furnace is closed at the top.

At the front of the furnace is the usual grate 39, extending rearwardly to the bridge wall, that supports the rear end of the grate and extends across the furnace. Between the front of the boiler 7 and the front wall the furnace is closed adjacent the `end of the boiler. At the rear of the grate I provide a bridge wall formed of a series of piers that extend upward from the floor 10 of the furnace to the boiler. As shown these piers extend in a single row transversely across the furnace, and are constructv` ed of brick work whereby an interior cham ber is formed. As shown I provide two intermediate piers 11 and 12 and two side piers 13 and 14: that are built against the side walls 8 and 9 of the furnace. The piers 11 and 12 have chambers 15 and 1G respectively, that at the bottom connect with horizontal passages 17 and 18, arranged in the floor of the furnace and eXtending rearwardly to the rear end of the furnace where they admit the Voutside air to the piers. These passages may be extended to have' an exit in the ash pit of the furnace, and have the front end closed by a block of suitable cement 36 that can be removed when it is desired to clean out these passages. The chambers in the piers are closed at the top, but the sides of the piers at the upper ends of the chambers are provided with numerous small openings 20, whereby the outside air after passing through the floor passages and the piers is fed to the furnace. The two side piers 13 and 141 have interior chambers 21 and 22,'

that connect with passages 23 and 2% in the floor; and these piers have an exit opening 25 on the inner walls only of these two piers since the outer walls are formed by the side walls .of the furnace. It will thus be understood that no alteration whatever is made in the side walls of the furnace7 whose duty is to support the boiler7 and which do not operate properly when formed with passages.

lft will be seen from Figs. 1 and 3 that I form a Chamber 21 in the pier 13 with the brick work projeeting inwardly in a stag` hao l-ro

gered arrangement, to provide a series of projections 37 to intercept the upward free passage of the air and cause it to take a zig-zag course. It will be understood that the projections extend transversely on their lower faces and are inclined at the upper faces, Which will prevent the accumulation of Vdust and particles. This will also assist in imparting heat to the air because the piers are subjected to the intense heat of the combustion in the vicinity of the grate. The chambers in the other piers are constructed in the same manner. The several piers it will be seen ar-e substantially rectangular in cross section and extend longitudinally for a much greater distance than the usual bridge wall, and are preferably of greater length than half the length of the grate. These piers are arranged in a single row'extending t 1ansversely across the furnace, and upward from the floor to the boiler7 whereby the furnace gases can only pass rearward between the piers, in intimatecontact with their side faces. The gases will have a kind of injector effect, to draw the air through the small holes in the piers and hence cause the admission of air from the chambers to the piers, and through the conduits in the floor. This air will become heated before mingling with the furnace gases and will supply a certain amount of oxygen to combine with the furnace gases and effect a practically perfect combustion, so that practically all of the carbon is consumed before reaching the chimney. At the front these piers are connected by a bridge wall 4:3 eX- tending up a short distance above the level of the grate 39.

To insure a further 'mingling of the gases, I provide a series of columns 2G and 27 and 28, eXtending from the floor to the boiler7 and one arranged directly in the rear of the passage between each of the piers. These columns are preferably made converging toward the passages7 to divide the gases as they flow past the piers. These columns Will becoinc heated from the gases, and will further promote combustion.

At the rear of the furnace I provide a baflle wall 29 extending transversely across the furnace, and projecting downwardly from the boiler, but providing ample free passageway by openings 30 and 31 near the floor of the furnace. In the form shown there is a central pier 32 and arches 33 and 34 serve to support the baffle wall. This will cause the gases after passing the three columns, to flow downwardly through the lower passag-es, after which the gases can pass upward to the boiler tubes. It will be seen from this construction that an ample supply of heated air is drawn into the furnace from the atmosphere, and not from the ash-pit, and such air is heated and delivered to-the furnace gases shortly after leaving the grate bars. The inixture of air and gases is deflected by the columns, and is further caused to mingle by being forced downwarclly in a battle Wall, before reaching the boiler tubes. By having the single row of piers, the accumulation of dust and soot is horizontally rearward from the front to an intermediate portion of the furnace, of a single row of hollow piers of substantially rectangular form that eXtend upward from the furnace floor to the boiler, the piers extending in a single transverse row with their parallel opposed side walls eXtending rear- Ward from the grate for a distance greater than half the length of the furnace grate and providing an unobstructed passage for the furnace gases between them, the furnace having conduits in the base to admit outside air to the piers, the piers having small openings in the side walls near the top to feed such air to the furnace, said piers being connected with brick work for a short distance at their forward portions to form a closed bridge wall at the rear of the grate extending upward a short distance above the grate, the hollow piers having the chambers formed with projecting portions flat at the bottom and inclined at the top to intercept the upward flow of the air.

2. In a boiler furnace, the combination with a boiler and the grate bars extending horizontally rearward from the front to an intermcdiate por-tion of the furnace, of a row of hollow piers of substantially rectangular form that extend upward from the furnace floor to the boiler, the furnace having conduits in the base to admit outside air to the piers, the piers having small openings in the side walls near the top to feed such air to the furnace, the hollow piers having the chambers formed with projecting portions flat at the bottom and inclined at the top to intercept the upward flow of the air.

3. In a boiler furnace, the combination with a boiler and grate bars extending horizontally rearward from the front to an intermediate portion of the furnace, of a row of hollow piers of substantially rectangular form that extend upward from the furnace floor to the boiler, the piers extending in a single transverse row with their parallel opposed side walls extending rearward from the grate and providing an unobstructed passage for the furnace gases between them, the furnace having conduits in the base to admit outside air to the piers, the piers having small opening-s in the side walls near the top to feed such air to the furnace, said piers being Connected with brick work for a short distance at their forward portions to form a closed bridge wall at therear of the grate extending upward a short distance above the grate, a set of short triangular columns extending from the floor to the boiler, one column located a short distance to the rear of each passage between said piers, the side walls of each column being converging at the' front to deflect the furnace gases passing rearward between the piers, and a baffle wall at the rear of the furnace extending from side to side to close the upper half of the Chamber to deflect the gases downward to the fioor of the chamber.

4;. In a boiler furnace, the combination with a boiler and the grate bars extending horizontally rearward from the front to the intermediate portion of the furnace, of a row of hollow piers that eXtend upWard from the furnace floor to the boiler, the furnace having conduits in the base to admit outside air to the piers, the piers having small openings in the side walls near the top to feed such air to the furnace, said piers being` Connected with brick work for a short distance at their forward portions to form a closed bridge wall at the rear of the grate extending upward a short distance above the grate, and a baifle wall at the rear of the furnace extending from side to side to close the upper half of the chamber to deflect the gases downward to the floor of the chamber.

WILLIAM LEMB.

copies of this patent may be obtained for five cents each, by addressing the Commissoner of atents,

` Washington, D. 6. 

